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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49b57f20f10da2ba5f7af5dedd9bb5427f355218ede0dc9f12ffe4ac5d13175b' 
  AND token = 'Gi4p1v82/5fl1y5673opA7ozSQb/Qb74tDW7fOSIe0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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