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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e24983747868e50e11cb3a9fe1a8bd85795896dffae229f0835b1cc9404a2976' 
  AND token = '029V0cal89l8sc9YANmkFp8WwQnQw3Pjh6VxLOmsLDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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