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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6095cb7ef80ce248bc28c02905798b01928976c5873ba1618e35cd27bec8d790' 
  AND token = 'EtnDiWAxZrKGCrd21Rr+oO8agzaG6crrBnags+m9r6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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