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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb70ca71500cefc106a5dc69d871f904bcf91d47cedc473eddef8388f9358d53' 
  AND token = 'CXeiSj7UjahJYPKPfe3hr7J/DfL4AOFH+ciIqdDD5N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}